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Programación Funcional con Scala
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Rebecca
September 25, 2013
Programming
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Programación Funcional con Scala
Una charla por Quito Lambda
Rebecca
September 25, 2013
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Transcript
PF! Rebecca Sliter, ThoughtWorks @rebeccasliter! con! Scala!
utiliza el JVM!
static-typed! utiliza el JVM!
static-typed! orientado a objetos! utiliza el JVM!
static-typed! orientado a objetos?! utiliza el JVM!
static-typed! orientado a objetos! utiliza el JVM!
static-typed! funcional! orientado a objetos! utiliza el JVM!
static-typed! funcional! orientado a objetos! objeto-funcional! utiliza el JVM!
funcional! Qué hace! a este lenguaje?!
Funciones de orden superior! Funciones que tienen otra función como
parametro!
Funciones de orden superior! Funciones que tienen otra función como
parametro! Funciones que retornan una función!
Funciones de orden superior! object Almuerzo {! "def main(args: Array[String])
{! " "println( apply( postre, 50) )! "}! ! "def apply(f: Int => String, v: Int) = f(v)! ! "def postre(x: Int) = “Comi “ + x.toString() + “ frutas.”! }! !
Funciones de orden superior! Comi 50 frutas.! object Almuerzo {!
"def main(args: Array[String]) {! " "println( apply( postre, 50) )! "}! ! "def apply(f: Int => String, v: Int) = f(v)! ! "def postre(x: Int) = “Comi “ + x.toString() + “ frutas.”! }! !
Evaluación estricta! scala> val a = b + 1; val
b = 2;! a: Int = 1! b: Int = 2! ! !
Evaluación estricta! perezosa! scala> lazy val a = b +
1; lazy val b = 2;! a: Int = <lazy>! b: Int = <lazy>! ! scala> a! res1: Int = 3! ! scala> b! res1: Int = 2! ! !
Currying! scala> def add(a: Int)(b: Int) = a + b!
add: (a: Int)(b: Int)Int! !
Currying! scala> def add(a: Int)(b: Int) = a + b!
add: (a: Int)(b: Int)Int! ! scala> add(5)(6)! res1: Int = 11! !
Currying! scala> def add(a: Int)(b: Int) = a + b!
add: (a: Int)(b: Int)Int! ! scala> add(5)(6)! res1: Int = 11! ! scala> val addTen = add(10)_! addTen: Int => Int = <function>! !
Currying! scala> def add(a: Int)(b: Int) = a + b!
add: (a: Int)(b: Int)Int! ! scala> add(5)(6)! res1: Int = 11! ! scala> val addTen = add(10)_! addTen: Int => Int = <function>! ! scala> addTen(6)! res2: Int = 16!
Combinadores Funcionales! scala> val numeros = List(1,2,3)! numeros: List[Int] =
List(1, 2, 3)! ! scala> numeros.map((i: Int) => i * 3))! res1: List[Int] = List(3, 6, 9)! ! !
Combinadores Funcionales! scala> val numeros = List(1,2,3)! numeros: List[Int] =
List(1, 2, 3)! ! scala> numeros.partition(_ +1 == 3))! res1: (List[Int], List[Int]) = (List(2),List(1, 3))! ! !
Tipado estático!
Tipado estático! *la inferencia de tipos!
Tipado estático! *la inferencia de tipos! scala> val x :
Int = 1 + 2! x: Int = 3! ! ! !
Tipado estático! *la inferencia de tipos! scala> val x :
Int = 1 + 2! x: Int = 3! ! ! ! scala> val x = 1 + 2! x: Int = 3! ! ! !
Cuando la inferencia no funciona…! scala> def factorial(n: Int) =
{! | if (n == 0) 1! | else n * factorial(n – 1)! | }! ! ! <console>:1: error: recursive method factorial needs result type! else n * factorial(n – 1)! " " " " ^! ! !
Cuando la inferencia no funciona…! scala> def factorial(n: Int) =
{! | if (n == 0) 1! | else n * factorial(n – 1)! | }! ! scala> def factorial(n: Int) : Int = {! | if (n == 0) 1! | else n * factorial(n – 1)! | }! Factorial: (n: Int)Int! ! !
orientado a objetos! funcional! objeto-funcional!
orientado a objetos! objeto-funcional! funcional!
orientado a objetos! Qué hace! a este lenguaje?!
Traits! Colecciones de fields y comportamientos que pueden extend o
mixin a sus clases. !
trait Pelicula {! "val tipo: String ! } ! !
Traits!
trait Pelicula {! "val tipo: String ! } ! !
class Comedia extends Pelicula {! "val tipo = “comedia”! }! ! Traits!
trait Pelicula {! "val tipo: String! } ! ! class
Comedia extends Pelicula with Tiempo {! "val tipo = “comedia”! "val longitud = 90! }! ! Traits! trait Tiempo {! "val longitud: Int! } ! !
Modules!
Recursos! Scala docs: docs.scala-lang.org! Simply Scala: simplyscala.com! Scala School: twitter.github.io/scala_school!
$ sbt console! !